Smatch static checker warning: fs/ksmbd/smb2pdu.c:7759 smb2_ioctl() warn: no lower bound on 'off' Fix unexpected result that could caused from negative off and bfz. Fixes: b5e5f9dfc915 ("ksmbd: check invalid FileOffset and BeyondFinalZero in FSCTL_ZERO_DATA") Reported-by: Dan Carpenter <error27@xxxxxxxxx> Signed-off-by: Namjae Jeon <linkinjeon@xxxxxxxxxx> --- fs/ksmbd/smb2pdu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c index 81e987114206..b7a420e0fcc4 100644 --- a/fs/ksmbd/smb2pdu.c +++ b/fs/ksmbd/smb2pdu.c @@ -7757,7 +7757,7 @@ int smb2_ioctl(struct ksmbd_work *work) off = le64_to_cpu(zero_data->FileOffset); bfz = le64_to_cpu(zero_data->BeyondFinalZero); - if (off > bfz) { + if (off < 0 || bfz < 0 || off > bfz) { ret = -EINVAL; goto out; } -- 2.25.1